Repeater system



10d.. 9, 1923.,V Mmzss Y R. C. MATHES REPEATER SYSTEM,

Original Filed April 26 1918 rasata oet e, ieaa ll T if;

)ROBERT C. MATHES,' OIF NEW YORK, N.' Y., ASSIGN'OR TO WESTERN El-LECTRI'C COM- PANY,- KNCOREORATED, OIF NEW YORK, N. Y., A CORPORATONOJE' NEW YORK.

ERIEJPFELTER SYSTEM.

Substitute for application Serial No. 230,978, led .april 26, 1919. This application filed April 5, 1921..

Serial No. 456,857.

To all 'wig/om it may concern: y

Be it known that I, Bonnin: C. MATHES, a citizen of the United States, residing at New York, in the county of Bronx, State of New York, have invented certain new and useful improvements in Repeater Systems, ot

which the following is a full, clear, concise, and exact description.'

This application is a substitute for the applicants case Serial Number 230,978 tiled April 26, 1918, which has become abandoned. rlllhe invention relates to repeater systems wherein relativelyweak currents arriving at a repeating station are to be repeated and 5 sent out upon the line in amplified form.

Such systems may be employed for amplitying telephone currents, ringing currents or the like.

Repeater systems have been proposed in 2@ which a one-way repeater is adapted for the ytwo-way transmissionV of current by reversing the connections of' the repeater to the line. This reversal has been accomplished automatically by means of a relay for each line and responsive to the current impressed on the line. The repeater is connected to transmit in one directionl or the other through the line, depending upon which of the two relays is energized.

An object of the present invention is to simplify circuits of this type and to this end the invention provides a repeating system wherein but a single relay responsive to the actuating c urrent is employed for reversibly connectingtlie repeater. The repeater is normally connected to transmit current in one direction betweenY the lines. li-f incom# ing current finds the repeater properly connectedy no change is made in the connections. 4@ lt the repeater is not in a condition to re! peat the incoming current the relay is Iactuated, which not only reverses the repeater connections but also transfers the control of the relay to the other line. The repeater and the relay are connected in conjugate relation to the line so that the relay will be actuated only by incoming current and not vby outgoing current. rllhis insures that after the relay has been transferred from the in- .5@ coming to the outgoing line, the relay will be unaffected by the outgoing currents and will onl be actuated by incoming currents,

'provide nected.

the repeater is improperly conl For further details ofthe invention reference may be had to the drawings, in which Fig. 1 illustrates ldiagrammatically one embodiment or the invention; and Tig. 2 shows the direction of. the magnetic flux produced by the winding of relay 7. j

Referring to Fig. 1 ofthe drawings, the lines 1 and 2 have provided therebetween an amplifier or repeater 3 which is adapted to be reversibly connected to the -lines by means of the electromagnetic switches 4 and 5. rlhe repeater 3 is here shown of the mechanidal type but may be of the vacuum tube type it desired. The alternating current relay 6 responds to current impressed on one or the other of the lines to operate the polarized relay 7 which operates the reversing switches 4 and 5 as well as the relay 8, the latter disconnecting the relay 6 fromI one of the lines and connecting it tothe other.

Current is supplied at times tothe switches 4 and 5 and to relay 8 by battery 21 in circuit with which is contact 22 on armature 16 of polarized relay 7. With armature V16 in the position shown the battery 21 is disconnected and in its alternate position it\ @9 is connected to `the switches'e and 5 and relay 8. The armature .16 is polarized and its movement is controlled by vibrating contact 9 through the intermediary of the windings 10, 11, 12 and 13 and the batteries 14 and 15. The armature 16 carries a contact 17, which, withA armature 16 in the position shown, closes a circuit through armature 16 and the four windings 10-13 to battery 15. The Contact 9 is in series at all times with the windings 10 and11.

If relay 6 is not energized, its contact 9 is closed and battery 15 supplies current to windings 10-1/3which are wound in such a direction thattli'e luxes produced by windings 10 and neutralize the fluxes produced by windings` 12 and 13. ln this condition the resultant eect of the windings 10-13 is zere'and the armature 16 remains in the position 'shown uninluenced by current through 4,the windings of relay 7. The relative direction of the fluxes produced by the windings of relay 7 are shown by the arrows in lli ig. 2. When the circuit of windings 10 and 11 is opened by the vibration of Contact 9 or otherwise, the windings 12 and 13 are eiective to move armature 16 to the left, Armature 16 moves sluggishly as com- Miti pared to contact 9 so that with contact 9 yi# tion shown. lVith line 2 as the incoming line, the armature 16 will be moved'to and remain lto the left. so that contact 22 will.

energize switches 4 and 5, thereby connect-- ing the input side of the repeater to 'line 2, its output side to line 1.

Relay 6, ywhen connected vby relay7 andl repeating coil 19 to the line 1, is not operated by outgoing currents in line 1 because. the repeaterconnections 24 `and the line 26 leading to relay Gare connected in conjugate relation to the/line 1 and the artificial line v23. Outgoing currents in line 2 likewise do not operate the relay 64 when the latter is connected to line 2,.the .repeating coil 18 and artificial line 2O corresponding to 'the elements 19and23, respective-ly, associated with line 1. After line has vbeen the. incoming line, until line 1 becomes the t incomingline, 'relays 4, 5 and 8will remain energized, relay 6 will remain deenergized. contact 9 will remain closed, and armature 16 .will remain to the left, since current flows' from battery 1 4 through coils l0, 11, 1 2 and 13, through contacts 17, andbaclr to battery 14the effects of coils 10ia`nd 111 neutralizing the effects of coils 12 and ll Then, when line 1 becomes the incoming line, relay 6 opens contact 9, thereby deenergizing coils '10 and v11, whereuponfcoils 12 and 13', fed from battery 14, move'armature 16 to the right. Since,as noted abo-ve, armature 16 is sluggish as compared to contact 9,'the latter closes before current 4from battery 15, fiowi`ng in coils 12 and 13,- can move armature' 16 back tothe left. Thus the circuit through the coils of relays 4,. 5 and 8, whichwas broken/at 22 'when armature 16 moved to vthe right,`remains open at 2 2. In fact, all of the switches remain as Nhown in the drawing until linev 2 becomes the. incoming line.

'With the armatures of the relay 8 lin the A positions shown in the drawing, the relay 6 is operatively connected by means of the repeating coil 18 to vthe line 2. With the armatures of'relay 8 in their alternate posi.,-

-tions the rclayis'operatively connected by means of the repeating coil 19 tothe line 1. For currents coming in over. the line l, with the connectionsas shown, thev incoming currents are supplied to the open contacts of the relay 8 and the operation vof the relay 6 is'prevented. This is desired,' for the incoming currents find the Wifi switchese 4 and 5 i' in proper positions to r supplied by repeating coil'18 'back to the relay, 6, as described above. If current cornes in over theline 2 itisnecessary to reversev the .connections of the'1repeater in vorder to'repeat these vc`urrents`to the line 1.

This is done as follows; The incoming cur- `v repeat current from the line 1 to the line 2. 'Outgoing current from the line .2 is not rents are transferred by means .of repeating coil 18 to the relay 6, which vibrates its armature 9 and moves armature 16 of relay I to its alternate position, the-reby connecting.

-6-'from line 2 andv connects the-relay 6to vthe line 1. The energization of switches 4 e and 5 reverses .the connectionv of the. re'

peater '8 so that the inputside of-'the samt is connected to theq line 2 andthe output side thereofv to the line 1, as required.

The above description is based onthe' as-t sumption that a very closebalance may be maintained b etween'lines 1 and 2 and their` artificial li`nes`23 and 20. In .a.ctiialpra`cticc however, considerable imbalance can bc taken care of by placing the apparatus at.

separate stations; actual linel, repeater 19 5 and artificial line being located at 4one station, represented in the drawingfat A; the .other line 2, repeater 18 and artificial line 20 being remote .from station A at sta'- tion'C; repeater 3, together with relay 6 and associated vapparatus being remote from "stations A and C Vand located at an inter.-

-mediate station B.

In actual practifethe 5' distance from station B to either of the stai tions. A or C would be a matter ofmiles, perhaps ten to fifteen standard cable miles. As above indicated the relay 6 is' to be operated only by incoming currents Yand not NLS by outgoing currcntsand this is secured in the following way by placing the apparatus at different stations as described. Assume that line 1 is an incoming .line and that re- .peater 3 compensates for the attenuation in thel line 24. 'The current at the output side of the repeater will then have practicallyth'el same intensity as the current transferred by repeating coil 19 to line 26. Current coining in over the line- 1 must be 'transferred to relay 6 with sufficient intensity to operate that relay'unlessthe repeater is already properly connected. lt isobvious thatjthis incoming current is subjected to the attenuation of. the line 26 4 Current which leaves the .output side of therepeater should all beisent out upon the line 2, Ibut due to the assumed imbalance between the line 2 and the artificial line- 20, a small fraction of current arriving at the repeating coil 18 will be. transferred to the line 27. ,If vthe line 25 is approximatelyfas long as the line 26, then the current froru the output side` ofA the repeater arriving at` the input side of repeating coil 18 will have practically the same amplitude as'the inconr ing currents supplied to the relay 6 by way of line 26. Only a very small fraction of the outgoing currents is transferred from line 2 to the line 27, and this relatively small fraction is subjected to the attenuation of the line 27, so that the unbalanced outgoing currents which are supplied-to the relay 6 by way of line 27 are very small in amplitude in comparison to the incoming currents which arc supplied to the relay 6 by way of the line 26. rll`he difference in amplitude of these two currents is sufiiciently large to maintain a proper' factor of safety whereby the relay G will respond to the relatively strong incoming current as desired but not to the relatively weak fraction of outgoing current which may come back over line Q7. This factor of safety obtains, ot course, also inf the case where line 2 is an incoming line and line l an outgoing line.

`What is claimed is: I

l. The combination of a telephone line, a balancing line therefor, a repeater for said line, and an alternating current relay for controlling said repeater, said repeater comprising terminals, and said relay and said terminals being associated in conjugate relation to said lines. v l

2. rThe combination of two telephone lines, an artificial line for each of said lines, a repeater tor said lines, and a relay controlling said. repeater, said repeater and said relay being associated in conjugate relation to each of said telephone lines and its corresponding artificial line. t

3. The combination of twov lines, a repeater` means for connecting said repeatei to said lines, a relay for controlling said means, and means for connecting said relay to one of said lines while the latter is supplying outgoing currents and for rendering said relay unresponsive to saidoutgoing currents.

4. A two-way repeating system-comprising two actual lines and their corresponding artificial lines, a repeater adapted to be m CD) reversibly connected between said lines and la relay adapted to control the repeater con- -nections, said relay and said-repeater being connected in' conjugate relation to each ot' said actual lines and theirA corresponding artificial lines.

5. A ltwo-way repeating system compris lines and their corresponding artificial lines,

one of said actual lines and its artificial line being located at a station remote from another station at which the other actual and artificial lines are located, said repeater and said relay being between said two stations and remotetherefroin.-

6. A line, a repeater, a relay for controlling the connections of said line to said repeater, said relay having a vibratile contact, and means comprising said contact and responsive to currentimpressed on said lines for connecting said relay to the output circuit of said repeater.

7. A two-way repeater system comprising two lines, a' repeater adapted to be reversibly connected thereto, and means comprising a single voice operated relay device for reversing the ,repeater connections for transmission in either direction between said lines.

8. A two-way repeating system comprising a line, a unidirectionally transmitting repeater, means operable to' reverse the .pointing of said repeater in said line, and

means responsive to alternating current energy approaching the repeater from the direction toward which it is pointed for causing said first mentioned means to initiate re'- versal of the pointing' ofthe repeater while it is transmitting, provided said energy is of sufficient magnitude.

lin witness whereof, l hereunto subscribe my name this 2l day of March A. D., 1921.

noemer c. Mari-ins. 

